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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /scripts/gcc-plugins/arm_ssp_per_task_plugin.c
parentInitial commit. (diff)
downloadlinux-upstream.tar.xz
linux-upstream.zip
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'scripts/gcc-plugins/arm_ssp_per_task_plugin.c')
-rw-r--r--scripts/gcc-plugins/arm_ssp_per_task_plugin.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/scripts/gcc-plugins/arm_ssp_per_task_plugin.c b/scripts/gcc-plugins/arm_ssp_per_task_plugin.c
new file mode 100644
index 000000000..8c1af9bdc
--- /dev/null
+++ b/scripts/gcc-plugins/arm_ssp_per_task_plugin.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "gcc-common.h"
+
+__visible int plugin_is_GPL_compatible;
+
+static unsigned int sp_mask, canary_offset;
+
+static unsigned int arm_pertask_ssp_rtl_execute(void)
+{
+ rtx_insn *insn;
+
+ for (insn = get_insns(); insn; insn = NEXT_INSN(insn)) {
+ const char *sym;
+ rtx body;
+ rtx mask, masked_sp;
+
+ /*
+ * Find a SET insn involving a SYMBOL_REF to __stack_chk_guard
+ */
+ if (!INSN_P(insn))
+ continue;
+ body = PATTERN(insn);
+ if (GET_CODE(body) != SET ||
+ GET_CODE(SET_SRC(body)) != SYMBOL_REF)
+ continue;
+ sym = XSTR(SET_SRC(body), 0);
+ if (strcmp(sym, "__stack_chk_guard"))
+ continue;
+
+ /*
+ * Replace the source of the SET insn with an expression that
+ * produces the address of the copy of the stack canary value
+ * stored in struct thread_info
+ */
+ mask = GEN_INT(sext_hwi(sp_mask, GET_MODE_PRECISION(Pmode)));
+ masked_sp = gen_reg_rtx(Pmode);
+
+ emit_insn_before(gen_rtx_set(masked_sp,
+ gen_rtx_AND(Pmode,
+ stack_pointer_rtx,
+ mask)),
+ insn);
+
+ SET_SRC(body) = gen_rtx_PLUS(Pmode, masked_sp,
+ GEN_INT(canary_offset));
+ }
+ return 0;
+}
+
+#define PASS_NAME arm_pertask_ssp_rtl
+
+#define NO_GATE
+#include "gcc-generate-rtl-pass.h"
+
+#if BUILDING_GCC_VERSION >= 9000
+static bool no(void)
+{
+ return false;
+}
+
+static void arm_pertask_ssp_start_unit(void *gcc_data, void *user_data)
+{
+ targetm.have_stack_protect_combined_set = no;
+ targetm.have_stack_protect_combined_test = no;
+}
+#endif
+
+__visible int plugin_init(struct plugin_name_args *plugin_info,
+ struct plugin_gcc_version *version)
+{
+ const char * const plugin_name = plugin_info->base_name;
+ const int argc = plugin_info->argc;
+ const struct plugin_argument *argv = plugin_info->argv;
+ int tso = 0;
+ int i;
+
+ if (!plugin_default_version_check(version, &gcc_version)) {
+ error(G_("incompatible gcc/plugin versions"));
+ return 1;
+ }
+
+ for (i = 0; i < argc; ++i) {
+ if (!strcmp(argv[i].key, "disable"))
+ return 0;
+
+ /* all remaining options require a value */
+ if (!argv[i].value) {
+ error(G_("no value supplied for option '-fplugin-arg-%s-%s'"),
+ plugin_name, argv[i].key);
+ return 1;
+ }
+
+ if (!strcmp(argv[i].key, "tso")) {
+ tso = atoi(argv[i].value);
+ continue;
+ }
+
+ if (!strcmp(argv[i].key, "offset")) {
+ canary_offset = atoi(argv[i].value);
+ continue;
+ }
+ error(G_("unknown option '-fplugin-arg-%s-%s'"),
+ plugin_name, argv[i].key);
+ return 1;
+ }
+
+ /* create the mask that produces the base of the stack */
+ sp_mask = ~((1U << (12 + tso)) - 1);
+
+ PASS_INFO(arm_pertask_ssp_rtl, "expand", 1, PASS_POS_INSERT_AFTER);
+
+ register_callback(plugin_info->base_name, PLUGIN_PASS_MANAGER_SETUP,
+ NULL, &arm_pertask_ssp_rtl_pass_info);
+
+#if BUILDING_GCC_VERSION >= 9000
+ register_callback(plugin_info->base_name, PLUGIN_START_UNIT,
+ arm_pertask_ssp_start_unit, NULL);
+#endif
+
+ return 0;
+}